Ejector for thread-rolling machines.



c. AXMACHER, T. A. GORMAN & I. HART.

EIECTOR FOR THREAD ROLLING MACHINES.

APPLICATION FILED APR.29, I9I5.

Patented; NW. 25, 1915.

2 SHEETS-SHEET I.

mvEmTonS WITNESSES C. AXMACHER, T. A. GORIVIAN & I. HART.

EIECTOR FOR THREAD ROLLING MACHINES.

APPLICATION FILED APR. 29. I9I5. 1.161586. liiflilftd Nov. 1915.

2 SHEETS-SHEET 2.

WITNESSES IEWENTORS Wzzfi UNTTFED STTES PATEEN @FFICE.

CHRIST AXMACHEB, THOMAS A. GOBMAN, AND JAMES HABIT, OF JOHNSTOWN,PENNSYLVANIA,

EJECIOE FOR THREAD-ROLLING MACHINES.

Application filed Apri129, 1915.

T 0 all whom it may concern:

Be'it known that we, Cinns'r Axamcrrns, THOMAS A. GORMAN, and JamesHART, all citizens of the United States, and residing at Johnstown, inthe county of Cambria and State of Pennsylvania, have invented certainnew and useful Improvements in Ejectors for Thread-Rolling Machines, ofwhich the following is a specification.

Our invention relates to machines by which helical threads are rolledupon the ends of cylindrical bolts or rods. In the use of such machinesit frequently happens that the bolt or rod on which a thread has justbeen rolled will stick and remain in position between the dies of thethread rolling machine. \Vhen the thread rolling dies do not clear thethreaded bolt at the end of the stroke of a thread rolling operation,the bolt is drawn backwardly between the threading dies by the backwardmovement of the reciprocating threading die, with the result ofdeforming and distorting the rolled thread on the end of such bolt.

One object of our invention is to provide a bolt ejector of novelconstruction having means whereby the bolts or rods are ejected frombetween the threading dies at the completion of each thread formingstroke of the thread rolling machine and sticking of the threaded boltsor rods between the dies with the consequent forming of defectivelythreaded bolts will be prevented and overcome.

Other objects of the invention will become apparent as will be morefully described hereinafter and be specifically pointed out in theappended claims' Referring now to the drawings forming a part of thisspecification, Figure 1 is a plan of a thread rolling machine having abolt ejector constructed and arranged and ap plied thereto in accordancewith our invention, the ejector being shown in its retracted orinoperative position. Fig. 2 is a plan of the front or die end of thethread rolling machine of Fig. 1, showing the ejector in bolt ejectingposition. Fig. 3 is a longitudinal side elevation showing the front ordie end of the machine and the ejector forming this invention. Fig. 4 isan end elevation of the die threading machine of the preceding figures,with the ejector shown as ap plied thereto in accordance with Ourinvention. Fig. 5 is a detail sectional elevation Specification ofLetters Patent.

Patented Nov. 23, 1915.

Serial No. 24,811.

showing the construction of the ejector mechanism forming thisinvention.

In the accompanying drawings, the numeral 2 designates the base or frameof a threadrolling machine, having a die holder 3 with a stationary dieremovably secured therein and having a cross head slide 5 with thereciprocating cross head (i mounted therein. The reciprocatory crosshead 6 is provided with reciprocating die 7 removably secured thereon,the thread rolling face 8 of the die 3 being arranged opposite thethread rolling face 9 of the die 7. Thecross head 6 is connected by apitman or connecting rod 10 to a crank pin 11 on the spur gear 12 whichis mounted on a shaft secured in the bearing H forming part of the frame2 of the thread rolling machine.

The spur gear 12 meshes with the spur pinion 15 on one end of thecounter shaft 16, this shaft being mounted in the bearing 17 formingpart of the frame 2. The 0pposite end of the shaft 16 is provided with aspur gear 18 which meshes with a spur pinion l9 on the overhanging endof the pulley shaft 20. The shaft 20 is provided with a pulley 21 whichis secured to the spur pinion 19 either directly or through the shaft 20so as to positively rotate the spur gear 19. The pulley 21 is connectedby a bolt (not shown) with a motor driven line shaft or driving motor.

The belt threading machine, in itself, not forming part of ourinvention, its construction is not described in detail.

Rigidly secured on the top face of the cross head bearing 5 by bolts 22,22, is a bracket bearing 23, and mounted in this bearing is a verticallyextending shaft 24. The shaft 2% is provided with a squared lower end 25and opposite sides of the squared end 25 are provided with transverselyextending recesses or grooves 26 and 27. The shaft 24 is adapted to turnin the bearing 23 and is held in position by means of a set collar 28,this collar having a set-screw The upper end of the shaft 24 is providedwith a transversely extending slot or groove 30 and secured on thecylindrical upper end of the shaft is a helically spring 31. The upperend 32 of this spring 31 is bent to extend into or through thetransverse groove 30 and the opposite end 33 of the spring 31 is bent soas to project downwardly into an opening hole 34 in the flange of thebracket bearing 23. Secured in the transverse recess 27 in the squaredend of the shaft 2& is a. downwardly and also outwardly curved ejectorarm 3% which has a hook on its outer end forming a bolt engaging-lug orshoulder thereon. Secured in the other transverse recess 26 in thesquared end of the shaft 24 is a horizontally extending ielding springarm 36.- The outer end of? this arm is bent or inclined, the inclinedportion 37 being adapted to engage or be engaged by the oppositelyinclined end 38 of the trigger 39, the trigger being adjustably securedby bolts 40 to one side of the reciprocating cross head 38, so as tobring the trigger into proper striking engagement with the end 37 of theswinging spring arm 36.

In. the operation of threading machines equipped with our improvedejector, the threads are rolled on the bolts or rods by the opposingfacesS and 9 otthe threading dies 4: and 7, the die 7 reciprocatingforwardly and backwa'rdly in front of the die 4 in the usual knownmanner. Suitable dies having been positioned on the thread rollingmachine the cross head 6 is advanced until the dies 4 and 7 are in therelative position shown in Fig. 2. The trigger 39 is then adjusted andsecured on the cross head (5 in position as shown in Fig. As thereciprocating cross head (3, which carries the reciprocating die '7,moves forwardly and the rear end of the die 7 reaches the end of itsforward movement position, adjacent to the front end of the die 4, theinclined end 38 of the trigger 39 engages with the inclined face 37 ofthe spring arm 36 and further movement of the cross head (5 causes thearm 36 to swing and turn the shaft 24 against the opposingact-ion of thespring 31. This movement of the shaft Ql swings the ejector arm 34 intoengagement with the bolt or rod between the dies, a short time beforethe rear end of the reciprocating die travels past the front end of thestationary die 4.. Engagement with the bolt prevents further swingingmove ment of the arm 13% and causes the yielding arm 36 to spring orbend as; the movement of the cross head continues in a forwarddirection. ilhen the lics reach the position shown in Fig. 2, the bolton rpd on which the thread has been rolled is clear of these dies andthe spring action ofjthe yielding arm 36 will forcibly eject the boltwhich now is in engagement with the oute'r end of the ejector arm 3ft.(in the return or backward stroke of the reciprmrating cross head, thespring 31 on the. shaft 24- actsto return the ejector arn 25i into itsretracted position shown in be above described operations are then'repeated with the successive bolts or' rods.

The advantages of our invention will be apparent to those skilled in theart. By the ejecting provision of our improved ejector mechanism thebolts are forced from between the threading dies of the threadingmachine at the completion of each thread rolling operation. Theapparatus is simple and is easily kept in repair. The ejector mechanismis mechanically actuated. so that the attention of workman isunnecessary. By its use the number of defectively threaded bolts androds is greatly lessened and damage to the threads by reason of stickingis entirely overcome.

Modifications in the construction and arrangement of the parts may bemade Without departing from our invention as defined in the appendedclaims.

ll'e claim l. A bolt ejector for thread rolling ma- 3. A bolt ejectorfo'r thread rolling machines comprising a reciprocating cross head, ayielding bolt ejecting mechanism movably mounted on said machine, saidmechanism being adapted to"move into bolt position prior to thecompletion of the thread rolling, operation, and means on the cross'headof said thread rolling machine engaging withand actuating said ejectingmechanism, to thereby engage and eject bolts between the dies of saidmachine at the completion of the thread rolling operation.

4. A bolt ejector for thread rolling machines comprising a reciprocatingcrosshead, a yielding bolt ejecting mechanism movably mounted on saidmachine, said mechanism being adapted to move into. bolt ejecting thethriad rolling operation, means on the cross head of said thread rollingmachine engaging with and actuating said e'ecting mechanism, to therebyen age and" eject bolts between the dies of said machine at thecompletion of the thread rolling operation, and yielding means forreturning said eject ingmechanism into position to engage with asucceeding bolt between the dies of said machine.

5. A bolt ejector for thread rolling machines comprising a reciprocatingcrosshead, a swinging arm movable into and out position prior to thecompletion of.

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of bolt ejecting position, a yielding arm connected to and arranged tomove said swinging arm into bolt ejecting position, and a-trigger on thereciprocating cross head of the thread rolling machine arranged toactuate said yielding arm at the end of the thread rolling operation tothereby move said swinging arm into bolt ejecting position.

6. A bolt ejector for thread rolling machines comprising a reciprocatingcrosshead, a swinging arm movable into and out of bolt ejectingposition, a yielding arm connected to and arranged to move said swingingarm into bolt ejecting position, a trigger on the reciprocating crosshead of the thread rolling machine arranged to actuate said yielding armat the end of the thread rolling operation, to thereby move and holdsaid swinging arm in bolt ejecting position, and a spring forming meansfor retracting said arms at the completion of the bolt ejecting movementthereof.

7. A bolt ejector for thread rolling machines, comprising areciprocating cross-- head, a swinging-arm arranged to eject bolts heldbetween the. threading dies, yielding means for holding said swingingarm in retracted position, a spring arm for actuating said swinging arm,and a trigger on the reciprocating cross-head of said threading machinearranged to engage the spring arm and more said swinging arm into boltejecting position at the completion of the thread rolling operation. v

8. A bolt ejector for thread rolling machines, comprising areciprocating cross head, a swinging arm, a shaft bearing on saidmachine, a pivot shaft in said bearing to which said swinging arm issecured, a spring on said shaft to hold the swinging arm in retractedposition, a shaft actuating arm on said shaft and a trigger on thereciprocating cross head of said machine, said trigger being arranged toengage the shaft actuating arm and move the ejector arm into boltejecting position.

CHRIST AXMACHER. THOMAS A. GORMAN. JAMES HART.

Witnesses:

W. MlLT. BROWN, H. W. SMITH.

